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Add private option to change build dialect from C++11

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Although libc++ only requires C++11 to build, there are other
reasons to turn on a newer dialect in the build. For example
IDE's may not highlight any C++14/C++17 in the headers when
configured for C++11. This patch add's a private option for
changing this.





git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@278638 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-08-14 22:51:54 +00:00
parent d6e36bb773
commit c9e74ddb6c
1 changed files with 5 additions and 3 deletions
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8
CMakeLists.txt
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@@ -301,9 +301,11 @@ remove_flags(-DNDEBUG -UNDEBUG -D_DEBUG
remove_flags(-Wno-pedantic -pedantic-errors -pedantic)
# Required flags ==============================================================
add_compile_flags_if_supported(-std=c++11)
if (NOT MSVC AND NOT LIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG)
message(FATAL_ERROR "C++11 is required but the compiler does not support -std=c++11")
set(LIBCXX_STANDARD_VER c++11 CACHE INTERNAL "internal option to change build dialect")
add_compile_flags_if_supported(-std=${LIBCXX_STANDARD_VER})
mangle_name("LIBCXX_SUPPORTS_STD_EQ_${LIBCXX_STANDARD_VER}_FLAG" SUPPORTS_DIALECT_NAME)
if (NOT MSVC AND NOT ${SUPPORTS_DIALECT_NAME})
message(FATAL_ERROR "C++11 or greater is required but the compiler does not support ${LIBCXX_STANDARD_VER}")
endif()
# On all systems the system c++ standard library headers need to be excluded.